BA10/NP207 To AX15/NP231 Swap Help - Jeep Wrangler Forum
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Old 04-14-2014, 08:57 PM   #1
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BA10/NP207 To AX15/NP231 Swap Help

Background: I have an '87 with the 4.2l I6/NP207 combo and I'm wanting to swap it for an AX15/NP231 combo.

1) What year AX15 (if there's any specific) will I need to get that will bolt to the '87 4.2?
2) Will I need to change the pilot bearing? If so, which one?
3) Will I need to change the clutch or flywheel? If so, which one?
4) Will I need to change the starter? If so, which one?
5) Will I need new mounts for the AX15/NP231?
6) Am I forgetting anything?

Thanks!

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Old 04-14-2014, 09:35 PM   #2
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You should try going on autozone, searching for those parts for your year, and later. Then maybe seeing I they're the same. There's your answer.

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Old 04-14-2014, 10:00 PM   #3
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Well I figured someone on here may have already done the swap and would be able to help me out.

I'll give it a shot.
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Old 04-14-2014, 10:26 PM   #4
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There's a couple of fantastic write-ups on this swap if you google it.

Basically, using the 4.2 flywheel & clutch for your year 4.2:

a 90-91 donor is a virtual bolt in using the 4.2 clutch, ax-15, bellhousing & attached Tcase. Pilot is the same (tho I replaced mine along w/ clutch), only have to drill new holes in skid plate to mount the trans (AX-15 mount). Even the speedo cable works fine.

Later versions of the AX-15 w/ big pilotshaft tip need a new pilot bushing (from CJ w/ 304) & may have a different speedo drive depending on year. If they are a 94-up, then they will need a different hydraulic line for the external slave cylinder too.

The starter remains the same.

It helps immensely to get the whole shebang from bellhousing to Tcase (including shifters/linkage!) from one donor. My 91 donor bolted right up, driveshafts & all.
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Old 04-14-2014, 10:42 PM   #5
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THANK YOU! This is exactly what I needed!

Was it a 90-91 YJ you used for the donor?
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Old 04-15-2014, 08:20 AM   #6
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You're welcome....Yes, my donor was a 91 YJ.

I replaced the clutch since I was in there at the time, as well as the slave cylinder w/ the best I could find. No problems in 2+ years of wheeling since then.
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Old 04-15-2014, 12:43 PM   #7
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If you are going to do this, then you'll definitely want the external slave for the AX15. 1994 and up will have this.

So either:

1) early AX15 for the input shaft diameter, but later AX15 bell housing, etc.

2) just get a later AX15 and deal with the special pilot bearing (my recommendation). You'll find a bunch more of them. And since they are newer, they will likely have fewer miles on them.
.
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Old 04-15-2014, 02:43 PM   #8
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What are the pro's and con's of an external slave cylinder?
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Old 04-15-2014, 04:41 PM   #9
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Quote:
Originally Posted by Brandon D View Post
What are the pro's and con's of an external slave cylinder?
There are no cons

The internal slave is a weak point, and you have to pull the transmission to fix it. It's an awesome thing to have

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